test: remove 13 more stale chromium-popup linux snapshots for wizard layout

All 13 baselines were generated before the notification-area layout
change (88fee08: padding-right: 4px, max-height: 180px,
overflow-y: auto) and were pulled back in via the master merge.

Affected spec files:
- monomer-creation.spec.ts: tests 4, 6 (×2)
- monomer-creation4.spec.ts: tests 25 (×2), 26 (×2)
- monomer-creation6.spec.ts: tests 12, 13
- 8792-rename-monomer-symbol-to-code.spec.ts: Cases 2, 3
- ketcher-3.11.0-bugs.spec.ts: Case 26
- ketcher-3.13.0-bugs.spec.ts: Case 11

Fixing these root-cause failures also resolves the cascade timeouts in
new-monomers (tests 13–16), 8464 Case 4, 8857 Case 7, and 3.13.0
Case 11 that were caused by the monomer wizard being left open after
a failed screenshot assertion.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people